Large-scale alignments from WMAP and Planck

Abstract

We revisit the alignments of the largest structures observed in the cosmic microwave background (CMB) using the seven and nine-year WMAP and first-year Planck data releases. The observed alignments -- the quadrupole with the octopole and their joint alignment with the direction of our motion with respect to the CMB (the dipole direction) and the geometry of the Solar System (defined by the Ecliptic plane) -- are generally in good agreement with results from the previous WMAP data releases. However, a closer look at full-sky data on the largest scales reveals discrepancies between the earlier WMAP data releases (three to seven-year) and the final nine-year release. There are also discrepancies between all the WMAP data releases and the first-year Planck release. Nevertheless, both the WMAP and Planck data confirm the alignments of the largest observable CMB modes in the Universe. In particular, the p-values for the mutual alignment between the quadrupole and octopole, and the alignment of the plane defined by the two with the dipole direction, are both at the greater than 3-sigma level for all three Planck maps studied. We also calculate conditional statistics on the various alignments and find that it is currently difficult to unambiguously identify a leading anomaly that causes the others or even to distinguish correlation from causation.

12 pages, 6 figures, submitted to MNRAS, v2: Clarification comment added, other minor improvements, v3: Updates to match published version, this includes a discussion of the Planck reported Doppler quadrupole correction of the cleaned, full-sky maps

References in corpus (18)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
• Planck 2018 results. VII. Isotropy and Statistics of the CMB
• Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum
• Local Voids as the Origin of Large-angle Cosmic Microwave Background Anomalies I
• CMB anisotropies seen by an off-center observer in a spherically symmetric inhomogeneous universe
• Lack of large-angle TT correlations persists in WMAP and Planck
• Correlating anomalies of the microwave sky: The Good, the Evil and the Axis
• Alignment tests for low CMB multipoles
• CMB data analysis and sparsity
• Anomalies in the low CMB multipoles and extended foregrounds
• ${\varphi }^4$ inflation is not excluded
• Harmonic Inpainting of the Cosmic Microwave Background Sky: Formulation and Error Estimate
• Dodecahedral topology fails to explain quadrupole-octupole alignment
• Introducing doubt in Bayesian model comparison
• Maxwell's Multipole Vectors and the CMB
• Reconstruction of Missing Data using Iterative Harmonic Expansion
• Consistency tests for Planck and WMAP in the low multipole domain

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